Closed-form and numerical radii, existence conditions, and radial stability are given for spherical timelike orbits in Kerr-Newman spacetimes, including an analytical ISCO radius formula.
(38) β+ > 0 corresponds to the prograde orbit, and β− < 0 corresponds to the retrograde orbit
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Radii of spherical timelike geodesics in Kerr-Newman black holes
Closed-form and numerical radii, existence conditions, and radial stability are given for spherical timelike orbits in Kerr-Newman spacetimes, including an analytical ISCO radius formula.